Chinese Journal of Catalysis ›› 2025, Vol. 71: 138-145.DOI: 10.1016/S1872-2067(24)60233-0

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Promoting stability of sub-3 nm In2S3 nanoparticles via sulfur anchoring for CO2 electroreduction to formate

Fanrong Chena,b,c, Jiaju Fub,*(), Liang Dingb,d, Xiaoying Lub, Zhe Jiangb,d, Xiaoling Zhanga,*(), Jin-Song Hub,d,*()   

  1. aSchool of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
    bBeijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China
    cShaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry & Chemical Engineering, Yan’an University, Yan’an 716000, Shaanxi, China
    dUniversity of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2024-11-13 Accepted:2024-12-17 Online:2025-04-18 Published:2025-04-13
  • Contact: * E-mail: hujs@iccas.ac.cn (J.-S. Hu), zhangxl@bit.edu.cn (X. Zhang), fujiaju@iccas.ac.cn (J. Fu).
  • Supported by:
    National Natural Science Foundation of China(22025208);National Natural Science Foundation of China(22075300);National Natural Science Foundation of China(22102191);Key Laboratory of Education Department of Shaanxi Province(20JS157)

Abstract:

The p-block metal (In, Sn, Bi, etc.)-based electrocatalysts have exhibited excellent activity in the electrocatalytic CO2 reduction (ECR) to formate. However, the rapid decrease in catalytic activity caused by catalyst reconstruction and agglomeration under ECR conditions significantly restricts their practical applications. Herein, we developed a sulfur anchoring strategy to stabilize the high-density sub-3 nm In2S3 nanoparticles on sulfur-doped porous carbon substrates (i-In2S3/S-C) for formate production. Systematic characterizations evidenced that the as-prepared catalyst exhibited a strong metal sulfide-support interaction (MSSI), which effectively regulated the electronic states of In2S3, achieving a high formate Faradaic efficiency of 91% at −0.95 V vs. RHE. More importantly, the sulfur anchoring effectively immobilized the sub-3 nm In2S3 nanoparticles to prevent them from agglomeration. It enabled the catalysts to exhibit much higher durability than the In2S3 samples without sulfur anchoring, demonstrating that the strong MSSI and fast charge transfer on the catalytic interface could significantly promote the structural stability of In2S3 catalysts. These results provide a viable approach for developing efficient and stable electrocatalysts for CO2 reduction.

Key words: Electrochemical CO2 reduction, Strong metal sulfide-support, interaction, In2S3 nanoparticles, Stability, Formate